"After dinner things become gayer still. The governor invited Vronsky to a concert in aid of ‘Our Serbian brothers’ which was being organized by his wife, who wished to make Vronsky’s acquaintance."

19th century Serbia
Public Domain19th century Serbia
This refers to the political turmoil in Serbia in the 1860s that culminated in clashes between the Ottomans and Serbian civilians in 1862. It was the second state in Eastern Europe to abolish serfdom and feudalism.